zìcóng císhànshāngdiàn kāishǐ fāfàng yǐhòu, zhìyuànzhě měitiān dōu lái.

Yes. They work together here.

• 自从 means since / ever since and introduces the starting point.
• 以后 means after and marks what comes after that event.

So 自从……以后 is a very common pattern meaning ever since... or from the time that... onward.

In this sentence:

• 自从慈善商店开始发放以后 = ever since the charity shop started distributing things

In everyday Chinese, you may also hear:

• 自从……
• ……以后
• 自从……以来

All can work in similar contexts, though 自从……以后 and 自从……以来 often sound especially natural for since then.

The structure is:

• 慈善商店 = subject
• 开始 = verb, to begin
• 发放 = another verb, to distribute / hand out

So 开始发放 means begin to distribute / start handing out.

This is a common Chinese pattern:

• 开始 + verb

Examples:

• 开始工作 = start working
• 开始下雨 = start raining
• 开始发放 = start distributing

So 慈善商店开始发放 means the charity shop began doing the action of distributing something.

The object is omitted because it is probably already understood from context.

Chinese often leaves out information that is obvious to the listener or reader. So if everyone already knows what the charity shop is giving out, Chinese does not need to repeat it.

For example, the full version might be something like:

• 开始发放食物
• 开始发放物资
• 开始发放救济品

But if that has already been mentioned, just 开始发放 is perfectly normal.

This kind of omission is much more common in Chinese than in English.

Good question. In Chinese, 都 is often used with words like 每, 每个, 每天, 每次, and so on.

So:

• 每天来 = come every day
• 每天都来 = come every single day / come every day

Both are possible, but 每天都来 sounds more complete and natural in many contexts.

Here, 都 helps express the idea of without exception:

• 每天都来 = they come on every day

You can think of 都 here as reinforcing the distributive meaning of 每.

Similar examples:

• 我每周都去。 = I go every week.
• 他每次都迟到。 = He is late every time.

Because Chinese often uses a bare noun for a general group.

• 志愿者 here means volunteers in a general sense.
• 志愿者们 would sound more like the volunteers as a specific, clearly identified group.

In many cases, Chinese does not need a plural marker when the meaning is already clear from context.

Since 每天都来 already suggests repeated action by a group, 志愿者 naturally reads as volunteers.

So:

• 志愿者每天都来 = Volunteers come every day.
• 志愿者们每天都来 = The volunteers come every day.

The version without 们 is often smoother and more neutral.

Chinese chooses 来 or 去 based on the speaker’s point of reference.

• 来 = come, toward the speaker or toward the place being treated as the reference point
• 去 = go, away from that point

So 志愿者每天都来 means the volunteers come to the relevant place, probably the charity shop or the place being talked about.

Even in English, whether we say come or go depends on perspective. Chinese works the same way.

If the speaker were talking from some other point of view, 去 might be possible in a different sentence.

Chinese does not mark tense the way English does.

Instead, time is usually shown through:

• time words
• context
• aspect markers
• sentence patterns

In this sentence, the time meaning comes from:

• 自从……以后 = since/ever since a certain point
• 每天都来 = every day

Together, they show:

1. a starting point in the past
2. a repeated action from then onward

So even without an English-style past or present perfect form, the sentence clearly means something like:

• from that point onward, volunteers come every day

Chinese often relies on this kind of time framing instead of verb tense endings.

Not necessarily.

You might expect 开始了 if you are thinking about a completed change of state, but in this sentence it is not required.

Why?

Because the time relationship is already made clear by 自从……以后. The sentence is focusing on the point from which the later situation holds, not on marking 开始 with 了.

So 开始发放 is fine here.

That said, in some contexts you may hear forms like:

• 自从慈善商店开始发放以后
• 自从慈善商店开始发放以来

Both are natural.

Chinese does not always need 了 just because English would use a past form.

There are other common versions.

For example:

• 慈善商店开始发放以后，志愿者每天都来。
• 自从慈善商店开始发放，志愿者每天都来。
• 自从慈善商店开始发放以来，志愿者每天都来。

These are all understandable.

A few notes:

• 自从……以后 is common and clear.
• 自从……以来 is also very common for ever since.
• Using only 以后 can also work if 自从 is omitted.

So the sentence you were given is natural, but it is not the only possible wording.

The comma separates the time/background clause from the main clause.

So the sentence is divided like this:

• 自从慈善商店开始发放以后，
• 志愿者每天都来。

The first part gives the time frame:

• ever since the charity shop started distributing...

The second part gives the main statement:

• volunteers come every day

This is very common in Chinese: put the time or background information first, then the main comment after it.

Yes, exactly.

每天都来 describes a repeated, regular action. In English, this is often expressed with the simple present:

• They come every day

So the sentence is not talking about one single arrival. It describes an ongoing pattern or routine that has been true since the earlier event.

This is a very common way Chinese describes habitual actions:

• 他每天都喝咖啡。 = He drinks coffee every day.
• 我们周末都去。 = We go every weekend.

So in your sentence, 志愿者每天都来 means this has become the normal pattern.